... 90 PF>95%, FAQ: 1.What is COB ?Chip-on Board, or COB, refers to the semiconductor assembly ... to better heat distribution and a lower number of solder joints;5) Shorter time-to-marketThe COB Led Downlight ... to insure high luminous flux and conformity light output.5. Heat dissipation: The multi-fin casting design ... ,Furniture, clothing, jewelry, etcWe also have 3,5,7,9,10,25,30w......welcome enquiry!Show: